Issue #21372 has been reported by skatkov (Stanislav (Stas) Katkov). ---------------------------------------- Bug #21372: Ruby is passing clang specific flags to GCC 15 and native gem doesn't build. https://bugs.ruby-lang.org/issues/21372 * Author: skatkov (Stanislav (Stas) Katkov) * Status: Open * ruby -v: ruby 3.4.4 * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Fedora 42 has ompilation errors while running `gem install extlz4`. ```sh At top level: cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been intended to silence earlier diagnostics cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have been intended to silence earlier diagnostics cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may have been intended to silence earlier diagnostics make: *** [Makefile:251: blockapi.o] Error 1 make failed, exit code 2 Gem files will remain installed in /home/sk/.local/share/mise/installs/ruby/3.4.1/lib/ruby/gems/3.4.0/gems/extlz4-0.3.4 for inspection. Results logged to /home/sk/.local/share/mise/installs/ruby/3.4.1/lib/ruby/gems/3.4.0/extensions/x86_64-linux/3.4.0/extlz4-0.3.4/gem_make.out ``` I have submitted a ticket with a gem, but I have hunch that this might not be an issue with a gem, but rather a ruby compatibility issue with the new GCC (15). @see https://github.com/dearblue/ruby-extlz4/issues/6 I have very little experience with C and how compilation works. But as far as I can understand, ruby was compiled with clang and is now passing some CLANG specifics flags to GCC 15 during native gem compilation - this causes a compilation error. ```sh ruby -rrbconfig -e 'puts RbConfig::CONFIG["warnflags"].split(/\s+/).grep(/-Wno-/).sort' -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value ``` ``` ruby -rrbconfig -e 'system RbConfig::CONFIG["CC"], "--version"' gcc (GCC) 15.1.1 20250521 (Red Hat 15.1.1-2) Copyright (C) 2025 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ``` All my attept to overwrite compiler to use clang don't work either. I tried the following: ``` gem install extlz4 -- --with-cc=clang CC=clang gem install extlz4 CC=/usr/bin/clang gem install extlz4 ``` ## System os: fedora 42 ruby: ruby 3.4.4 (2025-05-14 revision a38531fd3f) +PRISM [x86_64-linux] (but also tried it with 3.3.8, with no success) gcc: gcc (GCC) 15.1.1 20250521 (Red Hat 15.1.1-2) ## Workaround I run the following script and then it's possible to complete "bundle install" process. https://gist.github.com/skatkov/df4db6f8b76e58fc8eefaa92592f2c1a -- https://bugs.ruby-lang.org/